$8000 / 600 = $13.33 profit per item
At the end of the article they stated that they sold about 2700, which would be a profit of
2700 * $13.33 - $8000 = $28000
Then the real question becomes how much time did he invest into the whole thing and what was the resulting hourly rate.
$8000 / 600 = $13.33 profit per item
At the end of the article they stated that they sold about 2700, which would be a profit of
2700 * $13.33 - $8000 = $28000